Cinterion
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Java Terminals Hardware Interface Description
3.7 Weidmueller GPIO Interface
35
EHSxT_BGS5T_HID_v02 2014-05-23
Confidential / Preliminary
Page 28 of 70
EHS5T‘s RS-485 interface is based on the TIA/EIA-485 standard defining electrical character-
istics of drivers and receivers for use in balanced multidrop communication systems. RS-485
is used in a lot of different fieldbus systems like Profibus, Interbus, Modbus and P-net.
RS-485 uses a shielded twisted pair cable where the shield is used as ground return, and the
inner pairs are used for balanced communication. The two conductors in each pair are called
A and B. RS-485 is usually half-duplex.
Data transmission speed depends on the length of the RS-485 bus cable and may be up to
115kbps.
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